Tomato line FIR-XM17-4451

ABSTRACT

The invention provides seeds and plants of tomato line FIR-XM17-4451. The invention thus relates to the plants, seeds, plant parts, and tissue cultures of tomato line FIR-XM17-4451 and to methods for producing a tomato plant produced by crossing such plants with themselves or with another plant, such as a tomato plant of another genotype. The invention further relates to seeds and plants produced by such crossing. The invention further relates to plants, seeds, plant parts, and tissue cultures of tomato line FIR-XM17-4451 comprising introduced beneficial or desirable traits.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of U.S. Provisional Appl. Ser. No.62/970,972, filed Feb. 6, 2020, the entire disclosure of which isincorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to the field of plant breeding and, morespecifically, to the development of tomato hybrid DRTH5007 and tomatoline FIR-XM17-4451.

BACKGROUND OF THE INVENTION

The goal of vegetable breeding is to combine various desirable traits ina single variety. Such desirable traits may include any trait deemedbeneficial or desirable by a grower or consumer, including greateryield, resistance to insects or disease, tolerance to environmentalstress, and nutritional value.

Breeding techniques take advantage of a plant's method of pollination.There are two general methods of pollination: a plant self-pollinates ifpollen from one flower is transferred to the same or another flower ofthe same plant or plant variety. A plant cross-pollinates if pollencomes to it from a flower of a different plant variety.

Plants that have been self-pollinated and selected for type over manygenerations become homozygous at almost all genetic loci and produce auniform population of true breeding progeny, a homozygous plant. A crossbetween two such homozygous plants of different genotypes produces auniform population of hybrid plants that are heterozygous for manygenetic loci. Conversely, a cross of two plants each heterozygous at anumber of loci produces a population of hybrid plants that differgenetically and are not uniform. The resulting non-uniformity makesperformance unpredictable.

The development of uniform varieties requires the development ofhomozygous inbred plants, the crossing of these inbred plants, and theevaluation of the crosses. Pedigree breeding and recurrent selection areexamples of breeding methods that have been used to develop inbredplants from breeding populations. Those breeding methods combine thegenetic backgrounds from two or more plants or various other broad-basedsources into breeding pools from which new lines and hybrids derivedtherefrom are developed by selfing and selection of desired phenotypes.The new lines and hybrids are evaluated to determine which of those havecommercial potential.

SUMMARY OF THE INVENTION

In one aspect, the present invention provides a tomato plant of hybridDRTH5007 or line FIR-XM17-4451. Also provided are tomato plants havingall the physiological and morphological characteristics of such a plant.Parts of these tomato plants are also provided, for example, includingpollen, an ovule, an embryo, a seed, a scion, a rootstock, a fruit, anda cell of the plant.

In another aspect of the invention, a plant of tomato hybrid DRTH5007 ortomato line FIR-XM17-4451 comprising an added heritable trait isprovided. The heritable trait may comprise a genetic locus that is, forexample, a dominant or recessive allele. In one embodiment of theinvention, a plant of tomato hybrid DRTH5007 or tomato lineFIR-XM17-4451 is defined as comprising a single locus conversion. Inspecific embodiments of the invention, an added genetic locus confersone or more traits such as, for example, herbicide tolerance, insectresistance, disease resistance, and modified carbohydrate metabolism. Infurther embodiments, the trait may be conferred by a naturally occurringgene introduced into the genome of a line by backcrossing, a natural orinduced mutation, or a transgene introduced through genetictransformation techniques into the plant or a progenitor of any previousgeneration thereof. When introduced through transformation, a geneticlocus may comprise one or more genes integrated at a single chromosomallocation.

In some embodiments, a single locus conversion includes one or moresite-specific changes to the plant genome, such as, without limitation,one or more nucleotide modifications, deletions, or insertions. A singlelocus may comprise one or more genes or nucleotides integrated ormutated at a single chromosomal location. In one embodiment, a singlelocus conversion may be introduced by a genetic engineering technique,methods of which include, for example, genome editing with engineerednucleases (GEEN). Engineered nucleases include, but are not limited to,Cas endonucleases; zinc finger nucleases (ZFNs); transcriptionactivator-like effector nucleases (TALENs); engineered meganucleases,also known as homing endonucleases; and other endonucleases for DNA orRNA-guided genome editing that are well-known to the skilled artisan.

The invention also concerns the seed of tomato hybrid DRTH5007 or tomatoline FIR-XM17-4451. The seed of the invention may be provided as anessentially homogeneous population of seed of tomato hybrid DRTH5007 ortomato line FIR-XM17-4451. Essentially homogeneous populations of seedare generally free from substantial numbers of other seed. Therefore,seed of tomato hybrid DRTH5007 or tomato line FIR-XM17-4451 may bedefined as forming at least about 97% of the total seed, including atleast about 98%, 99%, or more of the seed. The seed population may beseparately grown to provide an essentially homogeneous population oftomato plants designated DRTH5007 or FIR-XM17-4451.

In yet another aspect of the invention, a tissue culture of regenerablecells of a tomato plant of hybrid DRTH5007 or tomato line FIR-XM17-4451is provided. The tissue culture will preferably be capable ofregenerating tomato plants capable of expressing all of thephysiological and morphological characteristics of the starting plantand of regenerating plants having substantially the same genotype as thestarting plant. Examples of some of the physiological and morphologicalcharacteristics of tomato hybrid DRTH5007 or tomato line FIR-XM17-4451include those traits set forth in the tables herein. The regenerablecells in such tissue cultures may be derived, for example, from embryos,meristems, cotyledons, pollen, leaves, anthers, roots, root tips,pistils, flowers, seed, and stalks. Still further, the present inventionprovides tomato plants regenerated from a tissue culture of theinvention, the plants having all the physiological and morphologicalcharacteristics of tomato hybrid DRTH5007 or tomato line FIR-XM17-4451.

In still yet another aspect of the invention, processes are provided forproducing tomato seeds, plants, and fruit, which processes generallycomprise crossing a first parent tomato plant with a second parenttomato plant, wherein at least one of the first or second parent plantsis a plant of tomato line FIR-XM17-4451. These processes may be furtherexemplified as processes for preparing hybrid tomato seed or plants,wherein a first tomato plant is crossed with a second tomato plant of adifferent, distinct genotype to provide a hybrid that has, as one of itsparents, a plant of tomato line FIR-XM17-4451. In these processes,crossing will result in the production of seed. The seed productionoccurs regardless of whether the seed is collected or not.

In one embodiment of the invention, the first step in “crossing”comprises planting seeds of a first and second parent tomato plant,often in proximity so that pollination will occur for example, mediatedby insect vectors. Alternatively, pollen can be transferred manually.Where the plant is self-pollinated, pollination may occur without theneed for direct human intervention other than plant cultivation.

A second step may comprise cultivating or growing the seeds of first andsecond parent tomato plants into plants that bear flowers. A third stepmay comprise preventing self-pollination of the plants, such as byemasculating the flowers (i.e., killing or removing the pollen).

A fourth step for a hybrid cross may comprise cross-pollination betweenthe first and second parent tomato plants. Yet another step comprisesharvesting the seeds from at least one of the parent tomato plants. Theharvested seed can be grown to produce a tomato plant or hybrid tomatoplant.

The present invention also provides the tomato seeds and plants producedby a process that comprises crossing a first parent tomato plant with asecond parent tomato plant, wherein at least one of the first or secondparent tomato plants is a plant of tomato hybrid DRTH5007 or tomato lineFIR-XM17-4451. In one embodiment of the invention, tomato seed andplants produced by the process are first generation (F₁) hybrid tomatoseed and plants produced by crossing a plant in accordance with theinvention with another, distinct plant. The present invention furthercontemplates plant parts of such an F₁ hybrid tomato plant, and methodsof use thereof. Therefore, certain exemplary embodiments of theinvention provide an F₁ hybrid tomato plant and seed thereof.

In still yet another aspect, the present invention provides a method ofproducing a plant derived from tomato hybrid DRTH5007 or tomato lineFIR-XM17-4451, the method comprising the steps of: (a) preparing aprogeny plant derived from tomato hybrid DRTH5007 or tomato lineFIR-XM17-4451, wherein said preparing comprises crossing a plant oftomato hybrid DRTH5007 or tomato line FIR-XM17-4451 with a second plant;and (b) crossing the progeny plant with itself or a second plant toproduce a seed of a progeny plant of a subsequent generation. In furtherembodiments, the method may additionally comprise: (c) growing a progenyplant of a subsequent generation from said seed of a progeny plant of asubsequent generation and crossing the progeny plant of a subsequentgeneration with itself or a second plant; and repeating the steps for anadditional 3-10 generations to produce a plant derived from tomatohybrid DRTH5007 or tomato line FIR-XM17-4451. The plant derived fromtomato hybrid DRTH5007 or tomato line FIR-XM17-4451 may be an inbredline, and the aforementioned repeated crossing steps may be defined ascomprising sufficient inbreeding to produce the inbred line. In themethod, it may be desirable to select particular plants resulting fromstep (c) for continued crossing according to steps (b) and (c). Byselecting plants having one or more desirable traits, a plant derivedfrom tomato hybrid DRTH5007 or tomato line FIR-XM17-4451 is obtainedwhich possesses some of the desirable traits of the line/hybrid as wellas potentially other selected traits.

In certain embodiments, the present invention provides a method ofproducing food or feed comprising: (a) obtaining a plant of tomatohybrid DRTH5007 or tomato line FIR-XM17-4451, wherein the plant has beencultivated to maturity, and (b) collecting at least one tomato from theplant.

In still yet another aspect of the invention, the genetic complement oftomato hybrid DRTH5007 or tomato line FIR-XM17-4451 is provided. Thephrase “genetic complement” is used to refer to the aggregate ofnucleotide sequences, the expression of which sequences defines thephenotype of, in the present case, a tomato plant, or a cell or tissueof that plant. A genetic complement thus represents the genetic makeupof a cell, tissue or plant, and a hybrid genetic complement representsthe genetic make-up of a hybrid cell, tissue or plant. The inventionthus provides tomato plant cells that have a genetic complement inaccordance with the tomato plant cells disclosed herein, and seeds andplants containing such cells.

Plant genetic complements may be assessed by genetic marker profiles,and by the expression of phenotypic traits that are characteristic ofthe expression of the genetic complement, e.g., isozyme typing profiles.It is understood that tomato hybrid DRTH5007 or tomato lineFIR-XM17-4451 could be identified by any of the many well-knowntechniques such as, for example, Simple Sequence Length Polymorphisms(SSLPs) (Williams et al., Nucleic Acids Res., 1 8:6531-6535, 1990),Randomly Amplified Polymorphic DNAs (RAPDs), DNA AmplificationFingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs),Arbitrary Primed Polymerase Chain Reaction (AP-PCR), Amplified FragmentLength Polymorphisms (AFLPs) (EP 534 858, specifically incorporatedherein by reference in its entirety), and Single NucleotidePolymorphisms (SNPs) (Wang et al., Science, 280:1077-1082, 1998).

In still yet another aspect, the present invention provides hybridgenetic complements, as represented by tomato plant cells, tissues,plants, and seeds, formed by the combination of a haploid geneticcomplement of a tomato plant of the invention with a haploid geneticcomplement of a second tomato plant, preferably, another, distincttomato plant. In another aspect, the present invention provides a tomatoplant regenerated from a tissue culture that comprises a hybrid geneticcomplement of this invention.

Any embodiment discussed herein with respect to one aspect of theinvention applies to other aspects of the invention as well, unlessspecifically noted.

The term “about” is used to indicate that a value includes the standarddeviation of the mean for the device or method being employed todetermine the value. The use of the term “or” in the claims is used tomean “and/or” unless explicitly indicated to refer to alternatives onlyor the alternatives are mutually exclusive. When used in conjunctionwith the word “comprising” or other open language in the claims, thewords “a” and “an” denote “one or more,” unless specifically notedotherwise. The terms “comprise,” “have,” and “include” are open-endedlinking verbs. Any forms or tenses of one or more of these verbs, suchas “comprises,” “comprising,” “has,” “having,” “includes,” and“including,” are also open-ended. For example, any method that“comprises,” “has,” or “includes” one or more steps is not limited topossessing only those one or more steps and also covers other unlistedsteps. Similarly, any plant that “comprises,” “has,” or “includes” oneor more traits is not limited to possessing only those one or moretraits and covers other unlisted traits.

Other objects, features, and advantages of the present invention willbecome apparent from the following detailed description. It should beunderstood, however, that the detailed description and any specificexamples provided, while indicating specific embodiments of theinvention, are given by way of illustration only, since various changesand modifications within the spirit and scope of the invention willbecome apparent to those skilled in the art from this detaileddescription.

DETAILED DESCRIPTION OF THE INVENTION

The invention provides methods and compositions relating to plants,seeds, and derivatives of tomato hybrid DRTH5007, tomato lineFIRXM12-4125, and tomato line FIR-XM17-4451.

Tomato hybrid DRTH5007, also known as 16-XM-FIR-5007, is a beef tomatovariety intended for a glasshouse production environment that develops aplant that produces globe-shaped, firm, very large fruit. The hybridcomprises resistance to HR: ToMV:0-2/ToTV/Ff:A-E/Fol:0,1/For/VaNd IR:TYLCV/Ma/Mi/Mj. Tomato hybrid DRTH5007 comprises the tomato torradovirus resistance traits described in U.S. Pat. No. 8,946,506.

Tomato line FIR-XM17-4451 develops an indeterminate plant that producesvery large fruit. FIR-XM17-4451 comprises resistance toToMV:0-2/ToTV/TYLCV/Fol:0,1/VaNd/Ma/Mi/Mj.

A. Origin and Breeding History of Tomato Hybrid DRTH5007

The parents of tomato hybrid DRTH5007 are tomato line FIRXM12-4125 andtomato line FIR-XM17-4451. The parent lines are uniform and stable, asis a hybrid produced therefrom. A small percentage of variants can occurwithin commercially acceptable limits for almost any characteristicduring the course of repeated multiplication. However no variants areexpected.

B. Physiological and Morphological Characteristics of Tomato HybridDRTH5007 and Tomato Line FIR-XM17-4451

In accordance with one aspect of the present invention, there areprovided plants having the physiological and morphologicalcharacteristics of tomato hybrid DRTH5007 and the parent lines thereof.Descriptions of the physiological and morphological characteristics ofsuch plants are presented in the tables that follow.

TABLE 1 Physiological and Morphological Characteristics of Tomato HybridDRTH5007 CHARACTERISTIC DRTH5007 Torero Seedling anthocyanin inhypocotyl of 2-15 cm present present seedling habit of 3-4 week oldseedling normal normal Mature Plant height (cm) 197.9 166.0 height longlong growth type indeterminate indeterminate form normal normal canopysize (compared to others of medium medium similar type) habit erectsemi-erect Stem anthocyanin coloration of upper third weak absent orvery weak length of internode medium medium branching sparseintermediate branching at cotyledon or first present present leafy nodenumber of nodes between first 7 to 10 7 to 10 inflorescence number ofnodes between early (first to 3.3 3.0 second, second to third)inflorescences number of nodes between later 3 3 developinginflorescences pubescence on younger stems moderately hairy moderatelyhairy Leaf type (mature leaf beneath the third tomato tomatoinflorescence) type of blade bipinnate bipinnate margins of majorleaflets (mature leaf deeply toothed shallowly beneath the thirdinflorescence) or cut, sps. toothed or toward base scalloped marginalrolling or wiltiness (mature slight absent leaf beneath the thirdinflorescence) onset of leaflet rolling (mature leaf early season N/Abeneath the third inflorescence) surface of major leaflets (mature leafrugose (bumpy rugose (bumpy beneath the third inflorescence) or veiny)or veiny) pubescence (mature leaf beneath the normal normal thirdinflorescence) attitude semi-drooping semi-drooping length medium mediumwidth broad broad size of leaflets large medium intensity of green colormedium to dark medium glossiness weak weak blistering weak mediumattitude of petiole of leaflet in relation semi-erect horizontal to mainaxis Inflorescence type mainly mainly uniparous uniparous type (thirdinflorescence) simple simple average number of flowers in 4.3 4.1inflorescence (third inflorescence) leafy or “running” inflorescence(third occasional occasional inflorescence) Flower color yellow yellowcalyx normal (lobes normal (lobes awlshaped) awlshaped) calyx-lobesapprox. equaling approx. equaling corolla corolla corolla color yellowyellow style pubescence dense dense anthers all fused all fused intotube into tube fasciation (first flower of second or absent absent thirdinflorescence) abscission layer present present (pedicellate)(pedicellate) length medium medium Fruit surface slightly rough slightlyrough base color (mature-green stage) apple or medium apple or mediumgreen green pattern (mature-green stage) uniform green uniform greengreen shoulder absent absent intensity of green color excluding mediumto dark medium shoulder (before maturity) green stripes (beforematurity) absent absent size very large very large ratio length/diametermoderately moderately compressed compressed shape in longitudinalsection oblate oblate shape of transverse/cross section irregularirregular shape of stem end indented indented shape of blossom endindented to flat indented to flat shape of pistil scar irregularirregular ribbing at peduncle end medium weak to medium depression atpeduncle end medium medium to strong size of stem/peduncle scar largelarge size of blossom scar medium medium to large point of detachment offruit at harvest at pedicel joint at pedicel joint (third fruit ofsecond or third cluster) length of dedicel (third fruit of second 10.612.5 or third cluster)(mm) length (mature) (stem axis) (mm) 73.2 71.6diameter at widest point (mm) 91.2 90.2 weight (mature) (g) 343.8 334.9core present present diameter of core in cross section in medium mediumrelation to total diameter number of locules more than six more than sixcolor (full ripe) red red color at maturity red red flesh color(full-ripe) red/crimson red/crimson flesh color red red glossiness ofskin medium to strong medium to strong flesh color with lighter and withlighter and darker areas darker areas in walls in walls locular gelcolor (table-ripe) red red firmness firm firm shelf life short mediumtime of flowering medium medium time of maturity late late ripening(blossom-to-stem axis) uniform uniform ripening uniformity uniformity(peripheral-to-central-radial axis) epidermis color yellow yellowepidermis normal normal epidermis texture tender tender pericarpthickness very thick very thick thickness of pericarp 9.6 8.9 Phenologyseeding to 50% flowering (1 open 51 51 on 50% of plants) (days) fruitingseason medium medium relative maturity in areas tested medium latemedium late Adaptation culture greenhouse greenhouse principle use freshmarket fresh market machine harvest not adapted not adapted Chemistryand Composition pH 4.4 4.4 Titratable acidity, as % citric acid 5.4 6.2Total solids (dry matter, seeds 4.7 4.5 and skin removed) (percentagetotal content) Soluble solids as °Brix 3.6 3.6 These are typical values.Values may vary due to environment. Values that are substantiallyequivalent are within the scope of the invention.

TABLE 2 Physiological and Morphological Characteristics of Tomato LineFIR-XM17-4451 CHARACTERISTIC FIR-XM17-4451 Torero Seedling anthocyaninin hypocotyl of 2-15 cm present present seedling habit of 3-4 week oldseedling normal normal height (cm) 302.8 219.9 height very long verylong growth type indeterminate indeterminate form lax, open normalcanopy size medium medium habit semi-erect semi-erect Stem anthocyanincoloration of upper third weak absent or very weak length of internodelong short branching sparse sparse branching at cotyledon or absentabsent first leafy node number of nodes between first 10 or more 7 to 10inflorescence number of nodes between early (first to 5.5 3.6 second,second to third) inflorescences number of nodes between later 5.1 4.1developing inflorescences pubescence on younger stems moderatelymoderately Leaf hairy hairy type tomato tomato type (mature leaf beneaththe third bipinnate bipinnate inflorescence) margins of major leaflets(mature leaf deeply shallowly toothed toothed beneath the thirdinflorescence) or cut, sps. or scalloped toward base marginal rolling orwiltiness (mature slight slight leaf beneath the third inflorescence)onset of leaflet rolling (mature leaf mid season early season beneaththe third inflorescence) surface of major leaflets (mature leaf rugoserugose beneath the third inflorescence) (bumpy or (bumpy or veiny)veiny) pubescence (mature leaf beneath the hirsute hirsute thirdinflorescence) attitude drooping semi-drooping length medium mediumwidth medium medium size of leaflets medium medium intensity of greencolor medium medium glossiness weak weak blistering weak medium attitudeof petiole of leaflet in horizontal horizontal relation to main axisInflorescence type mainly mainly uniparous uniparous type (thirdinflorescence) simple simple average number of flowers in 4.2 5.3inflorescence (third inflorescence) leafy or “running” inflorescence(third occasional occasional inflorescence) Flower color yellow yellowcalyx normal (lobes normal (lobes awl shaped) awl shaped) calyx-lobesshorter than approx. equaling corolla corolla corolla color yellowyellow style pubescence absent dense anthers all fused into all fusedinto tube tube fasciation (first flower of second occasionally absent orthird inflorescence) present abscission layer present present pedicellength short short Fruit surface slightly rough slightly rough basecolor (mature-green stage) apple or apple or medium green medium greenpattern (mature-green stage) uniform green uniform green green shoulderabsent absent intensity of green color excluding medium light to mediumshoulder (before maturity) green stripes (before maturity) absent absentsize very large very large ratio length/diameter moderately moderatelycompressed compressed shape in longitudinal section flattened flattenedshape of blossom end indented indented shape of stem end indentedindented shape of pistil scar irregular irregular ribbing at peduncleend weak weak to medium depression at peduncle end medium to medium tostrong strong shape of transverse/cross section round round (third fruitof second or third cluster) size of stem/peduncle scar large large sizeof blossom scar medium medium point of detachment of fruit at harvest atpedicel joint at pedicel joint (third fruit of second or third cluster)length of dedicel (third fruit of second 7.7 7.6 or third cluster)(mm)length (mature) (stem axis) (mm) 70.8 62.3 diameter at widest point (mm)96.7 87.1 weight (mature) (g) 425.9 299.6 core present present diameterof core in cross section in large large relation to total diameternumber of locules more than six more than six color (full ripe) red redcolor at maturity red red flesh color (full-ripe) red/crimsonred/crimson color of flesh (at maturity) red red locular gel color(table-ripe) red red flesh color with lighter and with lighter anddarker areas darker areas in walls in walls glossiness of skin mediummedium firmness medium to firm firm shelf life very short medium time offlowering very late late time of maturity very late very late ripening(blossom-to-stem axis) uniform uniform ripening uniformity uniformity(peripheral-to-central-radial axis) epidermis color yellow yellowepidermis normal normal epidermis texture tender tender pericarpthickness 8.3 8.8 pericarp thickness very thick very thick Phenologyseeding to 50% flowering 92 76 (1 open on 50% of plants) (days) fruitingseason medium medium relative maturity in areas tested late lateAdaptation culture greenhouse greenhouse principle use(s) fresh marketfresh market machine harvest not adapted not adapted Chemistry andComposition pH 4.3 4.0 Titratable acidity, as % citric acid 5.7 6.9Total solids (dry matter, seeds and skin 8.8 12.6 removed) (percentagetotal content) Soluble solids as °Brix 4.6 3.7 These are typical values.Values may vary due to environment. Values that are substantiallyequivalent are within the scope of the invention.

C. Breeding Tomato Plants

One aspect of the current invention concerns methods for producing seedof tomato hybrid DRTH5007 involving crossing tomato line FIRXM12-4125and tomato line FIR-XM17-4451. Alternatively, in other embodiments ofthe invention, tomato hybrid DRTH5007 or tomato line FIR-XM17-4451 maybe crossed with itself or with any second plant. Such methods can beused for propagation of tomato hybrid DRTH5007 or tomato lineFIR-XM17-4451 or can be used to produce plants that are derived fromtomato hybrid DRTH5007 or tomato line FIR-XM17-4451. Plants derived fromtomato hybrid DRTH5007 or tomato line FIR-XM17-4451 may be used, incertain embodiments, for the development of new tomato varieties.

The development of new varieties using one or more starting varieties iswell-known in the art. In accordance with the invention, novel varietiesmay be created by crossing tomato hybrid DRTH5007 followed by multiplegenerations of breeding according to such well-known methods. Newvarieties may be created by crossing with any second plant. In selectingsuch a second plant to cross for the purpose of developing novel lines,it may be desired to choose those plants which either themselves exhibitone or more selected desirable characteristics or which exhibit thedesired characteristic(s) when in hybrid combination. Once initialcrosses have been made, inbreeding and selection take place to producenew varieties. For development of a uniform line, often five or moregenerations of selfing and selection are involved.

Uniform lines of new varieties may also be developed by way ofdouble-haploids. This technique allows the creation of true breedinglines without the need for multiple generations of selfing andselection. In this manner true breeding lines can be produced in aslittle as one generation. Haploid embryos may be produced frommicrospores, pollen, anther cultures, or ovary cultures. The haploidembryos may then be doubled autonomously, or by chemical treatments(e.g., colchicine treatment). Alternatively, haploid embryos may begrown into haploid plants and treated to induce chromosome doubling. Ineither case, fertile homozygous plants are obtained. In accordance withthe invention, any of such techniques may be used in connection with aplant of the invention and progeny thereof to achieve a homozygous line.

Backcrossing can also be used to improve an inbred plant. Backcrossingtransfers a specific desirable trait from one inbred or non-inbredsource to an inbred that lacks that trait. This can be accomplished, forexample, by first crossing a superior inbred (A) (recurrent parent) to adonor inbred (non-recurrent parent), which carries the appropriate locusor loci for the trait in question. The progeny of this cross are thenmated back to the superior recurrent parent (A) followed by selection inthe resultant progeny for the desired trait to be transferred from thenon-recurrent parent. After five or more backcross generations withselection for the desired trait, the progeny have the characteristicbeing transferred, but are like the superior parent for most or almostall other loci. The last backcross generation would be selfed to givepure breeding progeny for the trait being transferred.

The plants of the present invention are particularly well suited for thedevelopment of new lines based on the elite nature of the geneticbackground of the plants. In selecting a second plant to cross withtomato hybrid DRTH5007 or tomato line FIR-XM17-4451 for the purpose ofdeveloping novel tomato lines, it will typically be preferred to choosethose plants which either themselves exhibit one or more selecteddesirable characteristics or which exhibit the desired characteristic(s)when in hybrid combination. Examples of desirable traits may include, inspecific embodiments, high seed yield, high seed germination, seedlingvigor, high fruit yield, disease tolerance or resistance, andadaptability for soil and climate conditions. Consumer-driven traits,such as a fruit shape, color, texture, and taste are other examples oftraits that may be incorporated into new lines of tomato plantsdeveloped by this invention.

Delayed fruit ripening is a trait that is especially desirable in tomatoproduction, in that it provides a number of important benefits includingan increase in fruit shelf life, the ability to transport fruit longerdistances, the reduction of spoiling of fruit during transport orstorage, and an increase in the flexibility of harvest time. The abilityto delay harvest is especially useful for the processing industry astomato fruits may be picked in a single harvest. A number of genes havebeen identified as playing a role in fruit ripening in tomato. Mutationsin some of these genes were observed to be correlated with an extendedshelf life phenotype (Gang et al., Adv. Hort. Sci. 22: 54-62, 2008). Forexample, WO2010042865 discloses that certain mutations in the 2nd or 3rdexon in the non-ripening (NOR) gene can result in extended shelf lifephenotypes. These mutations are believed to result in an early stopcodon. It is therefore expected that any mutation resulting in an earlystop codon in an exon in the NOR gene, particularly a mutation resultingin an early stop codon in the 3rd exon, will result in a slower ripeningor an extended shelf life phenotype in tomato. A marker to select forthe unique mutation of each allele and to distinguish between thedifferent alleles of the NOR gene in a breeding program can be developedby methods known in the art.

D. Further Embodiments of the Invention

In certain aspects of the invention, plants described herein areprovided modified to include at least a first desired heritable trait.Such plants may, in one embodiment, be developed by a plant breedingtechnique called backcrossing, wherein essentially all of themorphological and physiological characteristics of a variety arerecovered in addition to a genetic locus transferred into the plant viathe backcrossing technique. The term single locus converted plant asused herein refers to those tomato plants which are developed by a plantbreeding technique called backcrossing or by genetic engineering,wherein essentially all of the morphological and physiologicalcharacteristics of a variety are recovered or conserved in addition tothe single locus introduced into the variety via the backcrossing orgenetic engineering technique, respectively. By essentially all of themorphological and physiological characteristics, it is meant that thecharacteristics of a plant are recovered or conserved that are otherwisepresent when compared in the same environment, other than an occasionalvariant trait that might arise during backcrossing, introduction of atransgene, or application of a genetic engineering technique.

Backcrossing methods can be used with the present invention to improveor introduce a characteristic into the present variety. The parentaltomato plant which contributes the locus for the desired characteristicis termed the nonrecurrent or donor parent. This terminology refers tothe fact that the nonrecurrent parent is used one time in the backcrossprotocol and therefore does not recur. The parental tomato plant towhich the locus or loci from the nonrecurrent parent are transferred isknown as the recurrent parent as it is used for several rounds in thebackcrossing protocol.

In a typical backcross protocol, the original variety of interest(recurrent parent) is crossed to a second variety (nonrecurrent parent)that carries the single locus of interest to be transferred. Theresulting progeny from this cross are then crossed again to therecurrent parent and the process is repeated until a tomato plant isobtained wherein essentially all of the morphological and physiologicalcharacteristics of the recurrent parent are recovered in the convertedplant, in addition to the single transferred locus from the nonrecurrentparent.

The selection of a suitable recurrent parent is an important step for asuccessful backcrossing procedure. The goal of a backcross protocol isto alter or substitute a single trait or characteristic in the originalvariety. To accomplish this, a single locus of the recurrent variety ismodified or substituted with the desired locus from the nonrecurrentparent, while retaining essentially all of the rest of the desiredgenetic, and therefore the desired physiological and morphologicalconstitution of the original variety. The choice of the particularnonrecurrent parent will depend on the purpose of the backcross; one ofthe major purposes is to add some commercially desirable trait to theplant. The exact backcrossing protocol will depend on the characteristicor trait being altered and the genetic distance between the recurrentand nonrecurrent parents. Although backcrossing methods are simplifiedwhen the characteristic being transferred is a dominant allele, arecessive allele, or an additive allele (between recessive anddominant), may also be transferred. In this instance it may be necessaryto introduce a test of the progeny to determine if the desiredcharacteristic has been successfully transferred.

In one embodiment, progeny tomato plants of a backcross in which a plantdescribed herein is the recurrent parent comprise (i) the desired traitfrom the non-recurrent parent and (ii) all of the physiological andmorphological characteristics of tomato the recurrent parent asdetermined at the 5% significance level when grown in the sameenvironmental conditions.

New varieties can also be developed from more than two parents. Thetechnique, known as modified backcrossing, uses different recurrentparents during the backcrossing. Modified backcrossing may be used toreplace the original recurrent parent with a variety having certain moredesirable characteristics or multiple parents may be used to obtaindifferent desirable characteristics from each.

With the development of molecular markers associated with particulartraits, it is possible to add additional traits into an established germline, such as represented here, with the end result being substantiallythe same base germplasm with the addition of a new trait or traits.Molecular breeding, as described in Moose and Mumm, 2008 (PlantPhysiol., 147: 969-977), for example, and elsewhere, provides amechanism for integrating single or multiple traits or QTL into an eliteline. This molecular breeding-facilitated movement of a trait or traitsinto an elite line may encompass incorporation of a particular genomicfragment associated with a particular trait of interest into the eliteline by the mechanism of identification of the integrated genomicfragment with the use of flanking or associated marker assays. In theembodiment represented here, one, two, three or four genomic loci, forexample, may be integrated into an elite line via this methodology. Whenthis elite line containing the additional loci is further crossed withanother parental elite line to produce hybrid offspring, it is possibleto then incorporate at least eight separate additional loci into thehybrid. These additional loci may confer, for example, such traits as adisease resistance or a fruit quality trait. In one embodiment, eachlocus may confer a separate trait. In another embodiment, loci may needto be homozygous and exist in each parent line to confer a trait in thehybrid. In yet another embodiment, multiple loci may be combined toconfer a single robust phenotype of a desired trait.

Many single locus traits have been identified that are not regularlyselected for in the development of a new inbred but that can be improvedby backcrossing techniques. Single locus traits may or may not betransgenic; examples of these traits include, but are not limited to,herbicide resistance, resistance to bacterial, fungal, or viral disease,insect resistance, modified fatty acid or carbohydrate metabolism, andaltered nutritional quality. These comprise genes generally inheritedthrough the nucleus.

Direct selection may be applied where the single locus acts as adominant trait. For this selection process, the progeny of the initialcross are assayed for viral resistance or the presence of thecorresponding gene prior to the backcrossing. Selection eliminates anyplants that do not have the desired gene and resistance trait, and onlythose plants that have the trait are used in the subsequent backcross.This process is then repeated for all additional backcross generations.

Selection of tomato plants for breeding is not necessarily dependent onthe phenotype of a plant and instead can be based on geneticinvestigations. For example, one can utilize a suitable genetic markerwhich is closely genetically linked to a trait of interest. One of thesemarkers can be used to identify the presence or absence of a trait inthe offspring of a particular cross, and can be used in selection ofprogeny for continued breeding. This technique is commonly referred toas marker assisted selection. Any other type of genetic marker or otherassay which is able to identify the relative presence or absence of atrait of interest in a plant can also be useful for breeding purposes.Procedures for marker assisted selection are well known in the art. Suchmethods will be of particular utility in the case of recessive traitsand variable phenotypes, or where conventional assays may be moreexpensive, time consuming, or otherwise disadvantageous. In addition,marker assisted selection may be used to identify plants comprisingdesirable genotypes at the seed, seedling, or plant stage, to identifyor assess the purity of a cultivar, to catalog the genetic diversity ofa germplasm collection, and to monitor specific alleles or haplotypeswithin an established cultivar.

Types of genetic markers which could be used in accordance with theinvention include, but are not necessarily limited to, Simple SequenceLength Polymorphisms (SSLPs) (Williams et al., Nucleic Acids Res., 18:6531-6535, 1990), Randomly Amplified Polymorphic DNAs (RAPDs), DNAAmplification Fingerprinting (DAF), Sequence Characterized AmplifiedRegions (SCARs), Arbitrary Primed Polymerase Chain Reaction (AP-PCR),Amplified Fragment Length Polymorphisms (AFLPs) (EP 534 858,specifically incorporated herein by reference in its entirety), andSingle Nucleotide Polymorphisms (SNPs) (Wang et al., Science,280:1077-1082, 1998).

In particular embodiments of the invention, marker assisted selection isused to increase the efficiency of a backcrossing breeding scheme forproducing a tomato line comprising a desired trait. This technique iscommonly referred to as marker assisted backcrossing (MABC). Thistechnique is well-known in the art and may involve, for example, the useof three or more levels of selection, including foreground selection toidentity the presence of a desired locus, which may complement orreplace phenotype screening protocols; recombinant selection to minimizelinkage drag; and background selection to maximize recurrent parentgenome recovery.

E. Plants Derived by Genetic Engineering

Various genetic engineering technologies have been developed and may beused by those of skill in the art to introduce traits in plants. Incertain aspects of the claimed invention, traits are introduced intotomato plants via altering or introducing a single genetic locus ortransgene into the genome of a recited variety or progenitor thereof.Methods of genetic engineering to modify, delete, or insert genes andpolynucleotides into the genomic DNA of plants are well-known in theart.

In specific embodiments of the invention, improved tomato lines can becreated through the site-specific modification of a plant genome.Methods of genetic engineering include, for example, utilizingsequence-specific nucleases such as zinc-finger nucleases (see, forexample, U.S. Pat. Appl. Pub. No. 2011-0203012); engineered or nativemeganucleases; TALE-endonucleases (see, for example, U.S. Pat. Nos.8,586,363 and 9,181,535); and RNA-guided endonucleases, such as those ofthe CRISPR/Cas systems (see, for example, U.S. Pat. Nos. 8,697,359 and8,771,945 and U.S. Pat. Appl. Pub. No. 2014-0068797). One embodiment ofthe invention thus relates to utilizing a nuclease or any associatedprotein to carry out genome modification. This nuclease could beprovided heterologously within donor template DNA for templated-genomicediting or in a separate molecule or vector. A recombinant DNA constructmay also comprise a sequence encoding one or more guide RNAs to directthe nuclease to the site within the plant genome to be modified. Furthermethods for altering or introducing a single genetic locus include, forexample, utilizing single-stranded oligonucleotides to introduce basepair modifications in a tomato plant genome (see, for example Sauer etal., Plant Physiol, 170(4):1917-1928, 2016).

Methods for site-directed alteration or introduction of a single geneticlocus are well-known in the art and include those that utilizesequence-specific nucleases, such as the aforementioned, or complexes ofproteins and guide-RNA that cut genomic DNA to produce a double-strandbreak (DSB) or nick at a genetic locus. As is well-understood in theart, during the process of repairing the DSB or nick introduced by thenuclease enzyme, a donor template, transgene, or expression cassettepolynucleotide may become integrated into the genome at the site of theDSB or nick. The presence of homology arms in the DNA to be integratedmay promote the adoption and targeting of the insertion sequence intothe plant genome during the repair process through homologousrecombination or non-homologous end joining (NHEJ).

In another embodiment of the invention, genetic transformation may beused to insert a selected transgene into a plant of the invention ormay, alternatively, be used for the preparation of transgenes which canbe introduced by backcrossing. Methods for the transformation of plantsthat are well-known to those of skill in the art and applicable to manycrop species include, but are not limited to, electroporation,microprojectile bombardment, Agrobacterium-mediated transformation, anddirect DNA uptake by protoplasts.

To effect transformation by electroporation, one may employ eitherfriable tissues, such as a suspension culture of cells or embryogeniccallus or alternatively one may transform immature embryos or otherorganized tissue directly. In this technique, one would partiallydegrade the cell walls of the chosen cells by exposing them topectin-degrading enzymes (pectolyases) or mechanically wound tissues ina controlled manner.

An efficient method for delivering transforming DNA segments to plantcells is microprojectile bombardment. In this method, particles arecoated with nucleic acids and delivered into cells by a propellingforce. Exemplary particles include those comprised of tungsten,platinum, and preferably, gold. For the bombardment, cells in suspensionare concentrated on filters or solid culture medium. Alternatively,immature embryos or other target cells may be arranged on solid culturemedium. The cells to be bombarded are positioned at an appropriatedistance below the macroprojectile stopping plate.

An illustrative embodiment of a method for delivering DNA into plantcells by acceleration is the Biolistics Particle Delivery System, whichcan be used to propel particles coated with DNA or cells through ascreen, such as a stainless steel or Nytex screen, onto a surfacecovered with target cells. The screen disperses the particles so thatthey are not delivered to the recipient cells in large aggregates.Microprojectile bombardment techniques are widely applicable, and may beused to transform virtually any plant species.

Agrobacterium-mediated transfer is another widely applicable system forintroducing gene loci into plant cells. An advantage of the technique isthat DNA can be introduced into whole plant tissues, thereby bypassingthe need for regeneration of an intact plant from a protoplast. ModernAgrobacterium transformation vectors are capable of replication in E.coli as well as Agrobacterium, allowing for convenient manipulations(Klee et al., Nat. Biotechnol., 3(7):637-642, 1985). Moreover, recenttechnological advances in vectors for Agrobacterium-mediated genetransfer have improved the arrangement of genes and restriction sites inthe vectors to facilitate the construction of vectors capable ofexpressing various polypeptide coding genes. The vectors described haveconvenient multi-linker regions flanked by a promoter and apolyadenylation site for direct expression of inserted polypeptidecoding genes. Additionally, Agrobacterium containing both armed anddisarmed Ti genes can be used for transformation.

In those plant strains where Agrobacterium-mediated transformation isefficient, it is the method of choice because of the facile and definednature of the gene locus transfer. The use of Agrobacterium-mediatedplant integrating vectors to introduce DNA into plant cells is wellknown in the art (Fraley et al., Nat. Biotechnol., 3:629-635, 1985; U.S.Pat. No. 5,563,055).

Transformation of plant protoplasts also can be achieved using methodsbased on calcium phosphate precipitation, polyethylene glycol treatment,electroporation, and combinations of these treatments (see, for example,Potrykus et al., Mol. Gen. Genet., 199:183-188, 1985; Omirulleh et al.,Plant Mol. Biol., 21(3):415-428, 1993; Fromm et al., Nature,312:791-793, 1986; Uchimiya et al., Mol. Gen. Genet., 204:204, 1986;Marcotte et al., Nature, 335:454, 1988). Transformation of plants andexpression of foreign genetic elements is exemplified in Choi et al.(Plant Cell Rep., 13:344-348, 1994), and Ellul et al. (Theor. Appl.Genet., 107:462-469, 2003).

A number of promoters have utility for plant gene expression for anygene of interest including but not limited to selectable markers,scoreable markers, genes for pest tolerance, disease resistance,nutritional enhancements and any other gene of agronomic interest.Examples of constitutive promoters useful for plant gene expressioninclude, but are not limited to, the cauliflower mosaic virus (CaMV)P-35S promoter, which confers constitutive, high-level expression inmost plant tissues (see, for example, Odel et al., Nature, 313:810,1985), including in monocots (see, for example, Dekeyser et al., PlantCell, 2:591, 1990; Terada and Shimamoto, Mol. Gen. Genet., 220:389,1990); a tandemly duplicated version of the CaMV 35S promoter, theenhanced 35S promoter (P-e35S); the nopaline synthase promoter (An etal., Plant Physiol., 88:547, 1988); the octopine synthase promoter(Fromm et al., Plant Cell, 1:977, 1989); the figwort mosaic virus(P-FMV) promoter as described in U.S. Pat. No. 5,378,619; an enhancedversion of the FMV promoter (P-eFMV) where the promoter sequence ofP-FMV is duplicated in tandem; the cauliflower mosaic virus 19Spromoter; a sugarcane bacilliform virus promoter; a commelina yellowmottle virus promoter; and other plant virus promoters known to expressin plant cells.

A variety of plant gene promoters that are regulated in response toenvironmental, hormonal, chemical, or developmental signals can also beused for expression of an operably linked gene in plant cells, includingpromoters regulated by (1) heat (Callis et al., Plant Physiol., 88:965,1988), (2) light (e.g., pea rbcS-3A promoter, Kuhlemeier et al., PlantCell, 1:471, 1989; maize rbcS promoter, Schaffner and Sheen, Plant Cell,3:997, 1991; or chlorophyll a/b-binding protein promoter, Simpson etal., EMBO J., 4:2723, 1985), (3) hormones, such as abscisic acid(Marcotte et al., Plant Cell, 1:969, 1989), (4) wounding (e.g., wunl,Siebertz et al., Plant Cell, 1:961, 1989); or (5) chemicals, such asmethyl jasmonate, salicylic acid, or Safener. It may also beadvantageous to employ organ-specific promoters (e.g., Roshal et al.,EMBO J., 6:1155, 1987; Schernthaner et al., EMBO J., 7:1249, 1988;Bustos et al., Plant Cell, 1:839, 1989).

Exemplary nucleic acids which may be introduced to plants of thisinvention include, for example, DNA sequences or genes from anotherspecies, or even genes or sequences which originate with or are presentin the same species, but are incorporated into recipient cells bygenetic engineering methods rather than classical reproduction orbreeding techniques. However, the term “exogenous” is also intended torefer to genes that are not normally present in the cell beingtransformed, or perhaps simply not present in the form, structure, etc.,as found in the transforming DNA segment or gene, or genes which arenormally present and that one desires to express in a manner thatdiffers from the natural expression pattern, e.g., to over-express.Thus, the term “exogenous” gene or DNA is intended to refer to any geneor DNA segment that is introduced into a recipient cell, regardless ofwhether a similar gene may already be present in such a cell. The typeof DNA included in the exogenous DNA can include DNA which is alreadypresent in the plant cell, DNA from another plant, DNA from a differentorganism, or a DNA generated externally, such as a DNA sequencecontaining an antisense message of a gene, or a DNA sequence encoding asynthetic or modified version of a gene.

Many hundreds if not thousands of different genes are known and couldpotentially be introduced into a tomato plant according to theinvention. Non-limiting examples of particular genes and correspondingphenotypes one may choose to introduce into a tomato plant include oneor more genes for insect tolerance, such as a Bacillus thuringiensis(B.t.) gene, pest tolerance such as genes for fungal disease control,herbicide tolerance such as genes conferring glyphosate tolerance, andgenes for quality improvements such as yield, nutritional enhancements,environmental or stress tolerances, or any desirable changes in plantphysiology, growth, development, morphology or plant product(s). Forexample, structural genes would include any gene that confers insecttolerance including but not limited to a Bacillus insect control proteingene as described in WO 99/31248, herein incorporated by reference inits entirety, U.S. Pat. No. 5,689,052, herein incorporated by referencein its entirety, U.S. Pat. Nos. 5,500,365 and 5,880,275, hereinincorporated by reference in their entirety. In another embodiment, thestructural gene can confer tolerance to the herbicide glyphosate asconferred by genes including, but not limited to Agrobacterium strainCP4 glyphosate resistant EPSPS gene (aroA:CP4) as described in U.S. Pat.No. 5,633,435, herein incorporated by reference in its entirety, orglyphosate oxidoreductase gene (GOX) as described in U.S. Pat. No.5,463,175, herein incorporated by reference in its entirety.

Alternatively, the DNA coding sequences can affect these phenotypes byencoding a non-translatable RNA molecule that causes the targetedinhibition of expression of an endogenous gene, for example viaantisense- or cosuppression-mediated mechanisms (see, for example, Birdet al., Biotech. Gen. Engin. Rev., 9:207, 1991). The RNA could also be acatalytic RNA molecule (i.e., a ribozyme) engineered to cleave a desiredendogenous mRNA product (see, for example, Gibson and Shillito, Mol.Biotech., 7:125, 1997). Thus, any gene which produces a protein or mRNAwhich expresses a phenotype or morphology change of interest is usefulfor the practice of the present invention.

F. Definitions

In the description and tables herein, a number of terms are used. Inorder to provide a clear and consistent understanding of thespecification and claims, the following definitions are provided:

Allele: Any of one or more alternative forms of a genetic locus, all ofwhich alleles relate to one trait or characteristic. In a diploid cellor organism, the two alleles of a given gene occupy corresponding locion a pair of homologous chromosomes.

Backcrossing: A process in which a breeder repeatedly crosses hybridprogeny, for example a first generation hybrid (F₁), back to one of theparents of the hybrid progeny. Backcrossing can be used to introduce oneor more single locus conversions or transgenes from one geneticbackground into another.

Crossing: The mating of two parent plants.

Cross-Pollination: Fertilization by the union of two gametes fromdifferent plants.

Diploid: A cell or organism having two sets of chromosomes.

Emasculate: The removal of plant male sex organs or the inactivation ofthe organs with a cytoplasmic or nuclear genetic factor or a chemicalagent conferring male sterility.

Enzymes: Molecules which can act as catalysts in biological reactions.

F₁ Hybrid: The first generation progeny of the cross of two nonisogenicplants.

Genotype: The genetic constitution of a cell or organism.

Haploid: A cell or organism having one set of the two sets ofchromosomes in a diploid.

Linkage: A phenomenon wherein alleles on the same chromosome tend tosegregate together more often than expected by chance if theirtransmission was independent.

Marker: A readily detectable phenotype, preferably inherited incodominant fashion (both alleles at a locus in a diploid heterozygoteare readily detectable), with no environmental variance component, i.e.,heritability of 1.

Phenotype: The detectable characteristics of a cell or organism, whichcharacteristics are the manifestation of gene expression.

Quantitative Trait Loci (QTL): Quantitative trait loci (QTL) refer togenetic loci that control to some degree numerically representabletraits that are usually continuously distributed.

Resistance: As used herein, the terms “resistance” and “tolerance” areused interchangeably to describe plants that show no symptoms to aspecified biotic pest, pathogen, abiotic influence, or environmentalcondition. These terms are also used to describe plants showing somesymptoms but that are still able to produce marketable product with anacceptable yield. Some plants that are referred to as resistant ortolerant are only so in the sense that they may still produce a crop,even though the plants are stunted and the yield is reduced.

Regeneration: The development of a plant from tissue culture.

Royal Horticultural Society (RHS) Color Chart Value: The RHS Color Chartis a standardized reference which allows accurate identification of anycolor. A color's designation on the chart describes its hue, brightness,and saturation. A color is precisely named by the RHS Color Chart byidentifying the group name, sheet number, and letter, e.g.,Yellow-Orange Group 19A or Red Group 41B.

Self-Pollination: The transfer of pollen from the anther to the stigmaof the same plant.

Single Locus Converted (Conversion) Plant: Plants which are developed bya plant breeding technique called backcrossing or genetic engineering ofa locus, wherein essentially all of the morphological and physiologicalcharacteristics of a tomato variety are recovered in addition to thecharacteristics of the single locus.

Substantially Equivalent: A characteristic that, when compared, does notshow a statistically significant difference (e.g., p=0.05) from themean.

Tissue Culture: A composition comprising isolated cells of the same or adifferent type or a collection of such cells organized into parts of aplant.

Transgene: A genetic locus comprising a sequence which has beenintroduced into the genome of a tomato plant by transformation orsite-specific modification.

G. Deposit Information

A deposit of tomato line FIRXM12-4125 and tomato line FIR-XM17-4451,disclosed above and recited in the claims, has been made with theAmerican Type Culture Collection (ATCC), 10801 University Blvd.,Manassas, Va. 20110-2209. The dates of deposit for those deposited seedsof tomato line FIRXM12-4125 and tomato line FIR-XM17-4451 are Jun. 27,2016 and Jan. 14, 2020, respectively. The accession numbers for thosedeposited seeds of tomato line FIRXM12-4125 and tomato lineFIR-XM17-4451 are ATCC Accession Number PTA-123268 and ATCC AccessionNumber PTA-126371, respectively. Upon issuance of a patent, allrestrictions upon the deposits will be removed, and the deposits areintended to meet all of the requirements of 37 C.F.R. §§ 1.801-1.809.The deposits have been accepted under the Budapest Treaty and will bemaintained in the depository for a period of 30 years, 5 years after thelast request, or the effective life of the patent, whichever is longer,and will be replaced if necessary during that period.

Although the foregoing invention has been described in some detail byway of illustration and example for purposes of clarity andunderstanding, it will be obvious that certain changes and modificationsmay be practiced within the scope of the invention, as limited only bythe scope of the appended claims.

All references cited herein are hereby expressly incorporated herein byreference.

What is claimed:
 1. A tomato plant comprising at least a first set ofthe chromosomes of tomato line FIR-XM17-4451, a sample of seed of saidline having been deposited under ATCC Accession Number PTA-126371.
 2. Atomato seed that produces the plant of claim
 1. 3. The plant of claim 1,wherein the plant is an inbred plant of said tomato line FIR-XM17-4451.4. The seed of claim 2, wherein the seed is an inbred seed of saidtomato line FIR-XM17-4451.
 5. A plant part of the plant of claim 1,wherein the plant part comprises a cell of said plant.
 6. A tomato planthaving all of the physiological and morphological characteristics of theplant of claim
 1. 7. A tissue culture of regenerable cells of the plantof claim
 1. 8. A method of vegetatively propagating the plant of claim1, the method comprising the steps of: (a) collecting tissue capable ofbeing propagated from the plant of claim 1; and (b) propagating a tomatoplant from said tissue.
 9. A method of introducing a trait into a tomatoline, the method comprising: (a) utilizing as a recurrent parent theplant of claim 1 by crossing said plant with a donor plant thatcomprises a trait to produce F₁ progeny; (b) selecting an F₁ progenythat comprises the trait; (c) backcrossing the selected F₁ progeny witha plant of the same line used as the recurrent parent in step (a) toproduce backcross progeny; (d) selecting a backcross progeny comprisingthe trait and otherwise comprising the morphological and physiologicalcharacteristics of the recurrent parent line used in step (a); and (e)repeating steps (c) and (d) three or more times to produce a selectedfourth or higher backcross progeny that comprises the trait andotherwise comprises all of the morphological and physiologicalcharacteristics of tomato line FIR-XM17-4451.
 10. A tomato plantproduced by the method of claim
 9. 11. A method of producing a tomatoplant comprising an added trait, the method comprising introducing atransgene conferring the trait into the plant of claim
 1. 12. A tomatoplant produced by the method of claim 11, wherein said plant comprisesthe trait and otherwise comprises all of the morphological andphysiological characteristics of tomato line FIR-XM17-4451.
 13. A tomatoplant comprising at least a first set of the chromosomes of tomato lineFIR-XM17-4451, a sample of seed of said line having been deposited underATCC Accession Number PTA-126371, further comprising a transgene. 14.The plant of claim 13, wherein the transgene confers a trait selectedfrom the group consisting of male sterility, herbicide tolerance, insectresistance, pest resistance, disease resistance, modified fatty acidmetabolism, environmental stress tolerance, modified carbohydratemetabolism, and modified protein metabolism.
 15. A tomato plantcomprising at least a first set of the chromosomes of tomato lineFIR-XM17-4451, a sample of seed of said line having been deposited underATCC Accession Number PTA-126371, further comprising a single locusconversion.
 16. The plant of claim 15, wherein the single locusconversion confers a trait selected from the group consisting of malesterility, herbicide tolerance, insect resistance, pest resistance,disease resistance, modified fatty acid metabolism, environmental stresstolerance, modified carbohydrate metabolism, and modified proteinmetabolism.
 17. A method for producing a seed of a tomato plant derivedfrom tomato line FIR-XM17-4451, the method comprising the steps of: (a)crossing the plant of claim 1 with itself or a different tomato plant;and (b) allowing a seed of a tomato line FIR-XM17-4451-derived tomatoplant to form.
 18. A method of producing a seed of a tomato lineFIR-XM17-4451-derived tomato plant, the method comprising the steps of:(a) producing a tomato line FIR-XM17-4451-derived tomato plant from aseed produced by crossing the plant of claim 1 with itself or adifferent tomato plant; and (b) crossing the tomato lineFIR-XM17-4451-derived tomato plant with itself or a different tomatoplant to obtain a seed of a further tomato line FIR-XM17-4451-derivedtomato plant.
 19. The method of claim 18, the method further comprisingrepeating said producing and crossing steps of (a) and (b) using theseed from said step (b) for at least one generation to produce a seed ofan additional tomato line FIR-XM17-4451-derived tomato plant.
 20. Amethod of producing a tomato fruit, the method comprising: (a) obtainingthe plant of claim 1, wherein the plant has been cultivated to maturity;and (b) collecting a tomato fruit from the plant.